Light echoes reveal an unexpectedly cool η Carinae during its nineteenth-century Great Eruption

@article{Rest2012LightER,
  title={Light echoes reveal an unexpectedly cool η Carinae during its nineteenth-century Great Eruption},
  author={A. Rest and J. Prieto and N. Walborn and N. Smith and F. Bianco and R. Chornock and D. Welch and D. Howell and M. Huber and R. Foley and W. Fong and B. Sinnott and H. Bond and R. C. Smith and I. Toledo and D. Minniti and K. Mandel},
  journal={Nature},
  year={2012},
  volume={482},
  pages={375-378}
}
η Carinae is one of the most massive binary stars in the Milky Way. It became the second-brightest star in our sky during its mid-nineteenth-century ‘Great Eruption’, but then faded from view (with only naked-eye estimates of brightness). Its eruption is unique in that it exceeded the Eddington luminosity limit for ten years. Because it is only 2.3 kiloparsecs away, spatially resolved studies of the nebula have constrained the ejected mass and velocity, indicating that during its nineteenth… Expand
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